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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9530e355f5a30c1d6ccb3b2593f80e235923fd6ee7143bda04cc9eaca73176' 
  AND token = 'x8uI5uBQLVtT+oShoozKx5YXgG1OoxdkXkJlcZ9mtGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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