Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd31e86f965fd61f36b6fe1f9936baa8220bf23dd510a277027fb0b6c27e715' 
  AND token = 'K70e29XjbwMmo3kVmelNFO47PPTHZpXw7HjBfwQKsxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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