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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8200315daf8b63dfbfe9bc652ffa77873b015e88d86920f0759b9b831e21b1b8' 
  AND token = 'lFTSkGqp9mtG8Pi77VeO29u/GD/MvKcH5KRT+xR7tpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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