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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c2dd3a20d7444f8fce5f1199071cc44e3a84b8c99b7ff7eedc4bad5c4e34b3' 
  AND token = 'GQ8BF64k189de24oAwMNLxXBRAdKjn9Ggn+OjZm8A+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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