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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd083d92f2d9b3bf8c4a9301d081983b363dcbcc1349b0681f978e86ab421ebc' 
  AND token = '82kh9DHKKR7dycFtTW2PnNSjxLC1bNXsGL5TR8ASaCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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