Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680279abf84745989a0c26176c6d523303b1dbd67412071afe8f20f0b64ce83c' 
  AND token = 'ulBgal5KEa274Uv+h8ZWzNs55diwTyORFImyy558Mxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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