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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5279a36da2e4dd55baa5494b705ad93e22c1474c2157fc323942ae3cb920588' 
  AND token = 'L+TCAW+Tffu6kxPrnqPoe0u9ipI9uZzZvL9EV/R8MeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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