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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2889a1b9d6d9aef8db90d76860fc362aed160e99aded10b0749664b156e652' 
  AND token = '9sj4/4AQo/Wr2RiXmrWtwiE8Zk5DWPKBatRh//HX9gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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