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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736c21fc999ae6fb0e5e194383ba94415c6ae72c70272b237a94a1875b051259' 
  AND token = '+By9zDxp5lldF8p7c34EJpmfWM61lTN2UxuUXNbE6BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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