Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbcc2a05e6a1a55c969a6cdaae3bab629011f622d9b9560ef3c89c795f77415' 
  AND token = 'WJf/mR2qcMLeao5Crk5rPXyQRIXlRBEzYFtm3d766mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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