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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d3a401f14f5bf093608350bd8887b72bca521a14a125f833eaf26becfd687b' 
  AND token = 'uF+orO8P/rHqxsN1rV1zkkx1bptdrM5FPCGt2jGVqF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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