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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2be9bc987c15d502ec220a4e3b9c1cef1c21db34c50bf11786ea217be106113b' 
  AND token = 'uIODrMve929dkFkayRMjIDO1Tfa2G8+KESzyPjKD7WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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