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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1891d74d33b86a0fb4816c47595892f17a26dba0c247cf92d3b1122a78386187' 
  AND token = 'hk4ndDH1NL1Z6f8rNEEXcd6uONY+kFyZrK/5IGeCzgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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