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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bbbf15eb63e1a67f4563e67e1fe33c80008c5f28e04c573ac5f11173e39faf8' 
  AND token = 'zpkclO63IkiB52RDdPZ1Zn1K3kNvgT+ZA+a/xKOdak8=' 
  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"
    }
  }
}