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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f72ec9f0603bb96d1055a39665506faf50328f5b477c86dbfdef7f7a062803d' 
  AND token = 'XTc+Ku8P4CZW5NgKRZ+fH++VLr2n69LqQbxj7a/koVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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