Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cf240d11ef5942a0dff35a5354ff98b22b4e428daa4f200dfc5bcffab213308' 
  AND token = 'OLF6rvr5t8wYOXNTncc0a6hcvjRCEsWWbLHndH/Po+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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