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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216a98e9cc91ee760cf7cd63eb18662fc7aecc5250654b62e69513281519e0d3' 
  AND token = '9PRjh+sjAJJjmwb70noIgrofnlROJDCwrXK0wZg0Zu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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