Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b21b4e0deb95001c3410e27c5d0c6bfd9aefd5a0d0a6e354c6a35beef8b56b7' 
  AND token = 'j/pOvM3GlctcIrKU+e20EI2ichK+wb5JF7ulJiecqVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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