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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244a2e9883b3cf30b70e0cbdf1a1b4ce240e3bb65eb3bb00fd4dd25ff3813ef6' 
  AND token = '4Ih0LoDCHmQ3vxZc8NRyulfqIy8aUuOe0VvgjwlqOSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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