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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832983e6f81bdb428a336e2f75efc739da8a4527a30ba4e4e06bc7c084feb264' 
  AND token = 'LR4AxYZb2/3wU6P1wast0uVqsyMRUp7vXPQLYLXCixs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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