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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35edf1a9140576a27d496204878ca8863af03f542f2606d36a8c8ecc46cda842' 
  AND token = 'RQKCA6peDnxqEo0E5bvxCoedGEW0YyeCiF6+PR6LM1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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