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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fe9f1d03faa8d5907edf3146e5a3fd76fd87f85becd6e22bff42f47665e908' 
  AND token = 'Bz7fnMhe2A8GVocs0bo8YQw/AH/OBaLHC0AQ27UmJk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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