Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6753593a6c94277fff3a866d11def7810d3328b77eecd46f14508ab4ef3fe0dc' 
  AND token = 'r//AR/rVzIGRMf7sqq4MmVVa2i4RCKImGA0x0pDDM38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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