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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5af4cff18668a50fc955f72b445908302c002d59fbfba390c56662493f14852a' 
  AND token = 'QZESpqUx3xsCkaa5p9H/x39Tlt4uMlZbkqkmIiiuxNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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