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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf0a6945dd6133c9d937d84b06c121c01268be03b1a38066b05665954cf1658' 
  AND token = 'Rs6gt0FdYIg/WWS0rZETkr/M6GVCs4afOan1zZA5mfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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