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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277451ea355abe5890e024af6b96adf23f2a78d6ade76daec2cdc510355f5b6e' 
  AND token = 'n7A84OCNCI+jhjaGw/61sleWXLpJV8yTj2mXGMMSO0M=' 
  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"
    }
  }
}