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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd314c841064ff2c350e6b7161a5ffeb8f6922064d8eff6de68f1c942b1b42a43' 
  AND token = '7eltrZAB5oTKun+VW/JsU9iC0Bb53V/mCGj4TqNC2TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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