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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363226435f59786adef4827100baf0fa276b44413e5b26b7bdd999aa93a2dc8f' 
  AND token = 'LHclBbfLf6Zh3M5ujLsPEaNE7E4EcasTmSfFmL7aV80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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