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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0151f8e2029f99abe7802a81490c5797af30a7f4078a53a8964e09ca24ddae1f' 
  AND token = 'W2TcVCrFd44qaM82j9s3UBzowPRSraQO9s1wp5wXhl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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