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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3e0159ae0015253be3948927e644440e78ecfed6a9377ff7039e22804eef3c' 
  AND token = 'zcnuibaC0+YgD3vj/RcX9sRdidSe53UNHJ6Cutnvpy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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