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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fbb0cf38b22aa7391f5a3da258cfbcd9fbbc80f4a14f600f38ab1d9640ecf1b' 
  AND token = 'UNlAS+wai9zBtx7q2RQT778zCPuXVLgU/A8luHp22mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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