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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d627c62bc6c3c0fbf91d22e82b224174cfebcf1eb9c480da136d6b7e0f27292' 
  AND token = 'hyTlSjTi3nQZeE7UvyoOsoWfv1ErK9hZ8EDEK0mPQik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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