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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7318bc0109179ff6055228c52c224783f62e7a14b3c5477c991c1ea45c50bdd' 
  AND token = 'rsM0Ybg5ERyHgpvoE+dck2BACZWbP20J1pPE89Xrgic=' 
  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"
    }
  }
}