Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab1fbc9ef0577a11626a8b062e2168ffe4cb0e400b12b96abeb5cf83ef0e87b0' 
  AND token = 'Eeh/13W9Mf9r3FQV53Fu2AsDGOAdCkcP8i8dgIn6ygE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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