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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0669c1b93f49ec9ff83d23449e5dcab71d54c0eb83c1cc9f1bb8f5ca3fad23c' 
  AND token = 'bA4vRCPBb692hYuOY2ePJZU3M1YP/pDIvAUv+T1CPKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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