Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe60edc388825a31eaa3febf1c0f85777a27479d7d76d87da40f6e510127685' 
  AND token = '3NzFj12JVqmXTBjuNE9CzD/WQveLerY0nmmo7ckUs34=' 
  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"
    }
  }
}