SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c143e6c51f46022d107fe9db556b5fbe7cdcb7736d20c08c99b3896ddc293d' 
  AND token = '1F4Gf6z2HwnWYGY/wHjVRsXAnN4TCM+0mmRoOR9UJpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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