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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce139460abe1bf0f617bd199152e2c9d2f896728bd0d08004108b6c1f544002' 
  AND token = 'ACnN2CxwuKbyEyHbr2oANXY4j7GAg/jYLKhxb/UswbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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