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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52df4e49ead0459f3c64599416a352ddba5349a6d4771ef1745e594878dabc4' 
  AND token = 'ByL1dZy3TRdW8la7glkt0nk6vOfllD7euIaot/oLazs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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