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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a8506b9db7e2e694dbca9a180b8393ad467f8b48085b715ad17e4a554d17ed' 
  AND token = 'VvCyz8XzeDO/AS5v4JsXwSjIl5qt43rjCM51k2RiqF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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