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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b976bb9dc29f66e28f905dad9d8819010a4a8c3175a7dae40534b4c460034b16' 
  AND token = '98Kljim6bsmGhGF82IkX3UPYR4PsqLeet7yDK03XIWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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