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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8675c92e2616a9d1d0137d860b65b151b4c70a946815c315cac6bc6c56db5b1c' 
  AND token = 'a7NjXRV4Da8oyZaz0zrSzMSfdsvDqooyn5u3jESMKAg=' 
  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"
    }
  }
}