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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9e0f692ef03f842c7116fd8f0dbc52e94d88ae3ab6de3d7031081d24e5e7cf' 
  AND token = '3COgHRhaKVvfF1DLAECvjPMAjvfmVCFFOOGXLtmZzVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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