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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04d0192d0d4d3948d2d95e0c5a9958de54c20cb4600695757b16662323ca760' 
  AND token = '+Kh5zXfZp7cCJdp2WsQ0h4b8HfDJqGfk+o1ZUKorI4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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