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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5324fafc204c7c1964f6d6cc7291364bd1f4f6f591c1b5428dc7c81f5ddb6ae5' 
  AND token = 'UtdmI8PqT6M8LUoUfjhpRrX6eYGQDsMN4RUOfkmIQqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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