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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbd83ce732df61ac390088770115f8548a9b7005d88a5a4d241a5d917b932d5' 
  AND token = 'uzmBVLJBWuh9MJ1fTwRGMLpFaWag2S1cTEMcZJEKrW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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