Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e0c2af1f31ca040aae243e84d4a06ee6db09149af9a8fa28e46875d05ac7a2' 
  AND token = 'r6mVaJuCktBtcsgH3+toPlJ0NqyBw4qumml34nndAU0=' 
  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"
    }
  }
}