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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de286229df2612a125cd74e7cec16dde12b18a14f47c26d92eb3baeea459468' 
  AND token = '+1lPx01RLe79B34Q2IG4Iyn1dnwQ233XPcECOtOxthU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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