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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a899d62f2059fc1f4f89e3a3eb605eeaee78059ccaaebbb114e531b2e44f7a' 
  AND token = 'pntCtpMJ02V7fPtug++6yGckyhy2uG8E74jY1iZHw9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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