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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c7dc0f6e2930930fff4527eab3bc49898aa938f649a1cfac89f59493d7b0d4' 
  AND token = 'FXTO3rN8/6N8VwWBR9mmRcK1rraD89xeA09JJ9guaAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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