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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b4db2c13af84e1daedd7e74ab4dbb86daca9b6345b3d6a7113577375544dda' 
  AND token = 'FsoyN01Ip38Vskl23Co86bwXBkBDsxRqFc40Js9zSYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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