Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2468e49ca420b34ea43a6a92a27985c5967e835d3f7bcd1f4cf6f1fe3ecfb7a1' 
  AND token = 'lIVlLYxDDWUl/fd8B10ELSFai0K09xQvbMK8IN0c0Xw=' 
  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"
    }
  }
}