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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8bf1319ccc2e63649b491481bfea4c3c125a01a10b60f3cc646b214d12843f' 
  AND token = 'C3QjwkW3mQF40d6iHps3vhiJ9gjP5CKPH9wjgK82w5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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