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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f1845fd24fe434699df25a2b9ee5986cdfbc4c6d520a370dd96b30a2b2f43b' 
  AND token = 'g7qdFOfKX9lVb5ymcGBGVJ9IWmI1Uavma2EHVLFrx0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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