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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b227cc74fa05e6179e8b3db60c4135e4590801390dbbb1ce83ea258daf170549' 
  AND token = 'SR7+3Jp1N4bFaJjR91iNQxobOmZxY+FEcVzY6wR8ZEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}