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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1dbcde87c96f7347bd9e9218a780b57718eb933693e839e77e1c37cfca8d2e' 
  AND token = 'YDsL+AY4ftv9DKm6fZ6Xi4LouoeWtUYWq8Mq6Wa27lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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